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Centrocestus formosanus: surface morphology of metacercaria, adult and egg

Published online by Cambridge University Press:  05 June 2009

T. Srisawangwong ,
S. Pinlaor ,
P. Kanla  and
P. Sithithaworn
T. Srisawangwong
Affiliation:
Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
S. Pinlaor
Affiliation:
Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
P. Kanla
Affiliation:
Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
P. Sithithaworn
Affiliation:
Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
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Abstract

The surface morphology of metacercariae isolated from Puntius spp., adult worms from infected hamsters and eggs of Centrocestus formosanus (Digenea: Heterophyidae) were studied using scanning electron microscopy. It was found that the surfaces of the metacercariae and adult worms were closely similar in appearance. The oral sucker was surrounded by a circumoral expansion with two rows of 32 spines (16 spines each). The ventral sucker, with six large nonciliated papillae on the lip, and the genital opening were located midventrally. The excretory pore was terminal. The body surface was covered with pectinate scale-like spines of varying sizes. The scales in the middle area were larger than those in the anterior and posterior parts of the body. Sensory papillae, mostly uniciliated, were present in greater abundance at the anterior region of both stages. However, morphological variations were observed among the adults depending on the age of the worms. At 4 weeks, the oral sucker and circumoral expansion were cobblestone-like in structure and the grooves of spines split compared with their smooth surfaces at 10 days. In addition, the ventral sucker became depressed and its large papillae on the lip disappeared at 10 weeks post infection. Multiciliated papillae were also present in 10-week old worms. Each egg of this parasite possessed a prominent operculum and a latticed design on the egg shell.

Type
Research Papers
Information
Journal of Helminthology , Volume 71 , Issue 4 , December 1997 , pp. 345 - 350
Copyright
Copyright © Cambridge University Press 1997

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